If you want to do an inplace upgrade (retain all your installed programs) you will need to use the 32 bit disk.
If you want to use 64 bit upgrade disk, you will need to do a clean install and reinstall all your programs. Don't forget to backup all your data first.
If you need more info have a look here: http://windows.microsoft.com/en-us/windows7/help/upgrad...
Thewindows-7 upgrade package comes with a 32 bit dvd, and a 64 bit dvd.
If vista-32 is booted and running, insert the 32 bit upgrade dvd, select upgrade, and you will eventually be in windows-7 32 bit. Your old data that was replaced will be in windows.old which you can eventually delete.
If you want to upgrade to windows-7 64 bit, then you need to reinstall because the 64 bit package will not run under 32 bit. That means booting from the 64 bit upgrade dvd and select custom(not upgrade) install. This implies reinstalling your programs. Of course, you are using a new hard drive or partition, or you have backed up all your essential files.
If you run into problems, the upgrade package is considered retail, giving you access to microsoft support.
Ok i have a questin about the upgrade. Your suppose to install on a existing windows vista ? Well if I have a 32 bit vista will it make windows 7 32 bit?
When migrating from Windows Vista to Windows 7 you will have the option to select "custom" or "upgrade" install when prompted. By selecting the "upgrade" option, your documents and applications will follow and carry over through the install process. If you select, "custom" however you will be able to perform a clean install and all applications will have to be reinstalled manually -- documents will be moved to a folder entitled "windows.old".
For additional assistance with the migration of Windows Vista to Windows 7, Microsoft does have an official Windows 7 Support Forum located here http://tinyurl.com/9fhdl5 . It is supported by product specialists as well as engineers and support teams. You are welcome to check the threads there and receive additional assistance and feedback.